电子教案统一模板(模具)Unit7

《电子教案统一模板(模具)Unit7》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、Unit7TheCNCMachiningEquipmentLesson17TypesofCNCMachiningEquipment7.1Lesson18CNCTurningCenter7.2ReadingMaterials17TheAdvantagesofCNCMachines7.3ReadingMaterials18TheDisadvantagesofCNCMachines7.47.1Lesson17TypesofCNCMachiningEquipmentMachiningcentersarethelatestdevelopmentinCNCte

2、chnology.Thesesystemsareequippedwithautomatictoolchangerswiththecapabilityofchangingupto90ormoretools.[1]Manymachiningcentersarealsofittedwiththemovablerectangularworktablescalledpallets.Thepalletsareusedtoautomaticallyloadandunloadworkpieces.Atasinglesetupmachiningcenterscanp

3、erformsuchoperationsasmilling,drilling,tapping,boring,andsoon.[2]Additionallyutilizingindexingheads,somecentersarecapableofexecutingthesetasksonmanydifferentfacesofapartatspecifiedangles.Turningcenterswithincreasedcapacitytoolchangersarealsomakingstrongappearanceinmodernproduc

4、tionshops.[3]TheseCNCmachinesarecapableofexecutingmanydifferenttypesoflathecuttingoperationssimultaneouslyonrotatingpart.Inadditiontomachiningcentersandturningcenters,CNCtechnologyhasalsobeenappliedtomanyothertypesofmanufacturingequipment.Thesearewireelectricaldischargemachine

5、s(WEDM)andlasercuttingmachinesandsoon.WEDMmachinesutilizeaverythinwireasanelectrode.Thewireisstretchedbetweentworollersandcutsthepartlikeaband-saw.Materialisremovedbytheerosioncausedbyasparkthatmoveshorizontallywiththewire.CNCisusedtocontrolhorizontaltablemovements.WEDMmachine

6、sareveryusefulforproducingmoldinserts,extrusionandtrimdiesaswellasformingtools.[4]LasercuttingCNCmachinesutilizeanintensebeamoffocusedlaserlighttocutthepart.Materialunderthelaserbeamundergoesarapidriseintemperatureandisvaporized.Ifthebeampowerishighenough,itwillpenetratethroug

7、hthematerial.Becausenomechanicalcuttingforcesareinvolved,laserscutpartswithaminimumofdistortion.Theyhavebeenveryeffectiveinmachiningslotsanddrillingholes.7.2Lesson18CNCTurningCenterCNCturningcenters,unlikechuckingcenters,aremainlydesignedformachiningshaft-typeworkpieceswhichar

8、esupportedbyachuckandaheavy-dutytailstockcenter.Onfour-axisma